gistfile1.php

function mb_str_split($string,$string_length=1,$charset='utf-8') {
        if(mb_strlen($string,$charset)>$string_length || !$string_length) {
                do {
                        $c = mb_strlen($string,$charset);
                        $parts[] = mb_substr($string,0,$string_length,$charset);
                        $string = mb_substr($string,$string_length,$c-$string_length,$charset);
                }while(!empty($string));
        } else {
                $parts = array($string);
        }
        return $parts;
}